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DOAS measurements of atmospheric trace gases (KOL 10) (MAX-DOAS iup Bremen)

Quasi-continuous observation of several reactive atmospheric species are preformed by measuring the absorption of visible and near ultraviolet in sunlight scattered from the sky or in direct moonlight. Column abundance of molecules such as ozone, NO2, OClO, NO3, BrO and IO are derived by means of a Differential Optical Absorption (DOAS) algorithm.

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Project date

Starts
1995-01-01

Ends
2020-10-31

Project status

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Project type

  • remote sensing

Discipline

  • atmosphere

Project Keywords

  • atmosphere / atmospheric chemistry / trace gases/trace species
  • atmosphere / atmospheric chemistry / nitrogen compounds
  • atmosphere / air quality / sulfur oxides
  • atmosphere / atmospheric chemistry / halocarbons and halogens
  • atmosphere / atmospheric chemistry

Fieldwork information

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Type Period From To Coordinates Station Location
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Summary

Quasi-continuous observation of several atmospheric species are preformed by measuring the absorption of visible and near ultraviolet in sunlight scattered from the sky or in direct moonlight. Column abundance of molecules such as ozone, NO2, OClO, NO3, BrO and IO are derived by means of a Differential Optical Absorption (DOAS) algorithm and a radiative transfer model. With the help of a multi-axis telescope that is also able to collect light close to the horizon and was installed in 1999 and upgraded in 2002 it is also possible to obtain profiles of absorbers under clear sky conditions. These activities are part of calibration and validation studies of different satellite experiments (GOME, SAGE III, SCIAMACHY). The instrument is part of the Network of the Detection of Stratospheric Change (NDSC). The instrument has been installed in 1995 as the second UV/vis instrument from the Institute of Environmental Physics. One similar setup in Bremen is continuously running with the exception of short maintenance breaks since 1993. Recently instruments have been set up in Nairobi, Kenya (July 2002) and Summit, Greenland (July 2003) and Merida, Venezuela (April 2004).

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